Bolt anchor having alpha collapsible head



Sept. 20, 1932. H. w. PLEISTER 1,878,600

Bow ANCHOR mwme A COLLAPSIBLE mm ,7

Filed April 19, 1929 4 Sheets-Sheet 1 R M W M I /74 INVENTOR.

'BY M g ATTORNEY Sept. 20, 1932. H. w. PLEISTER 1,878,600

BOLT ANCHOR HAVING A COLLAPSIBLE HEAD Filed April 19, 1929 4 Sheets-Sheet 2 IN VEN TOR.

'BYW

ATTORNEY Sept. 20, 1932, H. w. PLEISTER 1378,600

BOLT ANCHOR HAVING A COLLAPSIBLE HEAD Filed April 19 1929 4 Sheets-Sheet 3 Sept, 20, 1932. H. W. PLEISSTER 9 9 BOLT ANCHOR HAVING A COLLAPSIBLE HEAD Filed April 19 192 9 4 sheets sheet 4 E-Ai Q, 7l-7"/7,

llilil lflllll Patented Sept. 20, 1932 UNITED STATES PATENT:

HENRY W. PLEISTER, F WESTFIELI), JERSEY, ASSIGNOR TO HENRY B. NEWHALL CORPORATION, OF GARWOOD, NEW JERSEY, A CORPORATION OF NEW JERSEY Application filed April 19, 1929. Serial No. 356,577.

My invention relates to bolt anchors and more particularly to bolt anchor shields having a collapsible head to permit the work to be drawn up flush against the surface of the wall, or other support, when, for any reason, a portion of the head may protrude from the hole in which the bolt anchor shield is mounted.

My invention further relates to certain articles of manufacture, combinations, and

sub-combinations, and details of construction, all of which will be more fully hereinafter described and pointed out in the claims.

In the drawings the same reference numerals refer to similar parts in the several Figures 1 to? illustrate a two part lag screw collapsible shield. Figure 1 is a side elevation. 1

Figure 2 is a plan view.

Figure 3 is a vertical section, on an enlarged scale, taken on line 3, 3 of Figure 1 looking in the direction of the arrows.

Figure 4 is a section on line 4, 4 of Figure 2 95 looking in the direction of the arrows.

Figure 5 is an end view.

Figure 6 is a vertical section through a support illustrating the shield partially expanded, its collapsible head-slightly protruding from the hole.

igure 7 is a vertical section, similar to Figure 6, illustrating the final expansion of the shield and the collapsing of its head, to permit the work to be brought up flush against the support.

' Figures 8, 9 and 10 illustrate a modification. Figure 8 is a side elevation.

-Figure 9 is a plan view.

, Figure 10 is a fragmentary vertical section, similar toFigure 7, but showing the head collapsed inward, rather than outward.

Figures 11 and 12 illustrate another modification. Figure 11 is a side elevation! Figure 12 is a plan view of Figure 11.

Figures 13, 14 and 15 illustrate a further modification. Figure 13 is a side elevation of a one part lag shield.

. Figure 14: is a plan view of Figure13.

- Figure 15 is a front elevation of Figure 13.

Figures 16 to 21 illustrate another modifi cation. 7 Figure 16 is a side elevation.

Figure 17 is a plan view of Figure 16.

Figure 18 is alongitudinal section on line 18-18 of Figure 17.

Figure 19 is a vertical section, on an enlarged scale, on line l919 of Figure 16. Figure 20 is a vertical section through a support, illustrating the ductile collapsible shield or anchor partially expanded and extending out from the hole in the support.

Figure 21 is a vertical section, similar to Figure 20, with the ductile shield or anchor fully expanded and its head collapsed, to bring the work up flushagainst the support.

My invention relates essentially to bolt anchors, and more particularly to a shield for bolt anchors having a collapsible head, which,

if. it extends out slightly from the hole in which it is mounted, will permit the head to be collapsed, thereby shortening the length of the shield and permitting the work, supported by the bolt anchor, to be brought up flush against the surface of the wall of the support. This insures a first-class workmanlike job with comparatively fast placing of the shield, for, with my invention, absolute accuracy in estimating the depth to which the shield must be located, to allow for any slipping or creeping of the shield, is not necessary. Should the shield protrude slightly from the hole in the wall when expanded, or partially expanded, it is not necessary to unfasten it and re-position the shield in the hole, to insure thework being brought up flush against the support. 1

On the contrary, should the-shield protrude slightly from the hole, further movement of the expanding means will collapse the head of the shield, more or less, thereby shorten-T ing-the shield and permitting the work to lie'fiush against the support. This not only enhances the appearance of the j ob but makes a. firmer bond, in that the work will frictionally engage the surface of the wall of the support, which will prevent teetering or pivoting of the work on the shield.

I have shown various forms of my inven-' tion in the drawings, but it is of course to as for example, the lag screw 6, is screwed into the shield 7, it may be found that the head 8 of the shield 7 extends out slightly from the hole 9 in the support 10. i Ordinarily, in such cases, the work 11 would be held away from the surface'12 of the support 10, giving'a very unworkmanlike and slovenly appearance to the job. To correct this,erequires a resetting of the shield'7 so that when it is again expanded, the work 11 will ure 7.

rest against the surface 12 of the wall.

my invention the resetting or readjustment of the shield is avoided. It is merely necessary, in my invention, to further operate the expanding member, as for example, the lag screw 6, which will cause the head 8 to collapse, more or less, shortening the length of the shield 7 and permitting the work to be brought up flush against the surface 12 of the support 10, as shown in Figure 7.

,This support 10 is ordinary masonry, concrete, brick, stone, terra 'cotta or similar material, and has to be drilled to form the hole 9, for the reception of the collapsible shield 7.

'In Figures 1' to 7 the weakening apertures or openings are 4, 4, and the cutaway portions are 5, 5, both being so'formed as to insure that the collapsible head 8,,will yield outwardly or radially and increase the bond or grip of the shield with the surface of the hole 9, see Figure 7, thereby preventing teetering. V In Figures 8,9 and 10 I have illustrated a collapsible shield 13 having a collapsible head 14 provided with weakening openings and cutaway portions 15, 1'5 and 16, 16 so that when the lag, or'other screw or member 6, exert-s sulficient pressure thecollapsible head 14 will collapse inward, Figure 10, rather than outward. V

In Figures 11 and 12 I have illustrated another modification in which the shield 17 is provided with a collapsible head 18 formed by means of the cutaway portions 19, 19; This head 18 will collapse in the same manner as previously described in connection with Fig- In Figures 13, 14 and 15 I have Show my invention in connection with a single member lag shield 20, instead of'the double form illustrated in Figures 1 to 10. In this form the expansion is produced only on one side of the lag, shield, such as 6.

In this form the lag shield 20 is provided with acollapsible head 21 by providing the head with the weakening apertures 22, 22 and the cutaway portions 122 and 122. If a portion of the head 21 extends out from the hole 9 in the support 10, it will be collapsed by the lag screw in the manner previously described in connection with the other forms.

In Figures 16 to 21 I have shown my invention applied to ductile bolt anchors or shields. -Y N Inthis modification thebolt anchor shield 36 is preferably formed of a plurality of tines 37, 37 and an integral collapsible head 38. The head is made collapsible by any suitable means such asby forming the large slotsor apertures 39, 39' in'thehead. j In practice when it is found'that'the end of the collapsible head 38 extends outward slightly from the hole 9 in the support 10, after the shield is partially expanded, Figure 20, it is not necessary to take down the fastening and relocate it in the hole. Simply by further screwing the screw 40 into the shield 36, the head 38 will be collapsed, as shown in Figure 21, thereby permitting the work 11 to be broughtup flush against'the surface 12 of the support, as described at lengthin connection with the other forms. It will be noted that the maximum ex: pansion of my bolt anchor'is at, or near, the lower end of the hole in the Wall or other support, and that tllBIGxlS practically little or no holding or gripping expansion in the hole near the surface of thelwall.

This is very important because if the surface of the wall is formed of friable material, as is often thecase, and any considerableportion of the expanding strains are exertedat or near the outer end of the hole, the surface of the wall will be cracked, or chipped, or marred, making an unsightly ob.

Moreover, by having the maximum expansion of the bolt anchor at or near the bottom of the'hole, makes a stronger fastening in that the expansion is exerted where the wall is strongest. 7

When the head is collapsed, as in Figures 7 andf21, there is practically little or no strain thrownon the walls of the hole near the surface of the wall or'other support. Such slight pressure that may be thrown on the wall of the hole near the surface, by collapsing the head, to permit the work to be drawn up flush with the surface of the wall, are insignificant and inconsequential, and are not relied upon to secure my bolt anchor in the hole. They are sufficient, however, to prevent teetering.

It will, further, be noted that in my bolt anchor the expansion is radial and immediate, when the screw or bolt-is screwed into it. The bolt anchor is immediatelyheld fast to the walls of the hole and its position in the hole is fixed; The main gripping portions of my boltfanchor do not later slide with relation to the walls of the hole. A portion, the weakened head, does move with relation to the walls of the hole, but this weakened head is not the main gripping portion of the bolt anchor. It is simply crushed, bent, or flexed between the fast gripping surfaces, securely expanded near the bottom of the hole, and the head of the bolt or screw, or the work supported. This bending or flexing of the head, if it does touch the walls of the hole, sets up only a minor or inconsequential grip which is not relied upon to secure the bolt anchor in the hole, but does prevent teetering of the bolt anchor.

The advantages of this construction have been previously pointed out in the specification.

Having thus described this invention in connection with illustrative embodiments thereof, to the details of which I do not desire to be limited, what is claimed as new and what is desired to secure by Letters Patent is set forth in the appended claims.

What I claim is:

1. A new article of manufacture comprising a bolt anchor having a plurality of pivoted inner rigid, noncollapsible, radially 0perative expanding members provided with outer integral collapsible heads to permit a portion of the heads of the pivoted members which may protrude from a hole of insufficient depth in the wall or other support, to be collapsed, while the rigid noncollapsible portions of the pivoted members are firmly and 4 immovably held within the hole, that the work supported may be brought up flush against the surface of the wall,'even though 7 axial bore and with an outer integral collapsible head, to permit a portion of the head which may protrude from a hole of insuflicient depth in a wall or support to be collapsed while the rigid, noncollapsible portion is firmly and immovably held within the hole, means to secure the said rigid, noncollapsible members together, and a bolt adapted to engage with the walls of the tapered axial bore to radially expand the said rigid expanding members, that the work supported may be brought up flush against the surface of the wall even though the hole has been negligently drilled, thereby avoiding the necessity of removing the bolt, bolt anchor, and work, and redrilling the hole to the proper depth.

3. In combination a tubular expansion shield formed of two halves having a tapered and threaded interior bore and a lag screw, which when turned into the shield will first create a rigid immovable expansive gripat 

